Laser-GMA hybrid welding of API 5L X70 with 23 mm plate thickness using 16 kW disk laser and two GMA welding power sources

Abstract

Evaluation criterion and closed-loop control of penetration status during laser-MIG hybrid welding J. Laser Appl. 22, 92 (2010); 10.2351/1.3492616 Studies on characteristics of CO 2 laser-GTAW hybrid welding of austenitic stainless steel J. Laser Appl. 22, 79 (2010); 10.2351/1.3455995The effect of shielding gas composition on welding performance and weld properties in hybrid CO 2 laser-gas metal arc welding of carbon manganese steel Hybrid processes have been established for the joining of thick plates. The presented approach enables single side welding of thick metal plates by combining a laser beam and two gas metal arc (GMA) welding torches in one setup. By using this hybrid process for joining high material thicknesses, manufacturing time can be significantly reduced in comparison to conventional multilayer arc welding processes. Additionally, new joint designs can be used to reduce filler metal consumption. In order to benefit from these economic advantages, and to make use of brilliant high power lasers in pipeline manufacturing, this hybrid process needs to run robustly for common gap and tolerance ranges. The process time, compared to conventional methods, will be significantly decreased, due to the use of disk lasers with a maximum output power of 16 kW combined with two high power GMA subprocesses. For process development, American Petroleum Institute (API) 5L X70 pipeline steel plates with a thickness of 23 mm have already been joined in a flat position using a single weld pass. Based on these parameter studies, the process limitations have been determined with regard to energy input, gap bridgeability, vertical edge offset, and a lateral offset of the energy sources from the weld joint. The robustness of the hybrid process developed has been demonstrated in experiments representative of the pipeline application. V C 2014 Laser Institute of America.

Heat treatment of welded joints of steel 0.3С–1Cr–1Si produced by high-power fiber lasers

“…And in general to satisfy oneself of the applicability of classical approaches of material science [17,18,20,21,[34][35][36] to the welded joints of steel 0.3С-1Cr-1Si produced at high speeds using high energy sources [14,15,32]. Fig.…”

“…99.99% Argon was used as a shielding gas to protect the top part of molten pool, flow rate of the shielding gas is 17 l/min. The process stability was provided by the use of non-extreme modes of laser radiation up to 10 kW [14,15,32].…”

“…1, two electric ovens SNOL 7.2/1300 were used. The thermal processing was aimed at increase of plasticity [20], with maintaining high strength properties of the welded joint having a martensite structure [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] with hardness of 8500-9000 MPa. For studying the mechanical properties and microstructure, the samples were prepared from the welded blank No.1 (no heat treatment-NHT), No.…”

As-Used Materials for Marine Industry

“…In some industries such as shipbuilding, rig construction, oil and gas, mechanical engineering, stainless steel welding plays a very important role [1], [2]. However, in practice stainless steel welds, especially the link between stainless steels and structural steels, are commonly encountered with the following problems: Due to differences in crystalline structure, atomic diameter, solubility and diffusion of solid and liquid metals, etc., the mechanical durability, plasticity Weld joints when applying conventional welding technologies.…”

Microstructure and Mechanical Properties of Narrow Gap Laser-Arc Hybrid Welded 40 mm Thick Mild Steel

“…Laser-arc hybrid welding (LAHW) has been one of the techniques with the most potential for fusion welding in decades [ 15 ], offering deep penetration, stable processing, high welding speed and great adaptability under severe conditions. Materials with thickness of 15–28 mm could be penetrated at one pass by LAHW with a laser power higher than 10 kW [ 16 , 17 , 18 ]. Because of these advantages, LAHW started to be employed in modern industries.…”